JPH09169307A - Packaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a good packaging, by controlling the tension acting on a packaging film in a packaging device in which an article to be packaged is pushed up from the underside of the tensed and supported film and the peripheral edge of the film is turned in to the bottom face side. SOLUTION: This packaging device is provided with a distance-adjusting device composed of a screw shaft 22, a motor 24, etc., adjusting the distance between both units 18, 19 by transferring one of a pair of transfer units 18, 19 holding both side edges of a film 3 and conveying it to a packaging station 5, to the breadthwise direction of the film, and also provided with a controller 9 to control the distance-adjusting device in a synchronous motion with the turning-in mechanism so that the tension of the film 3 is retained in the optimum condition when the film 3 is turned in to the bottom face side of the article by the turning-in mechanism 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging apparatus, and more particularly to pushing up an article to be packaged from below a film tensioned and held in a packaging station and folding the peripheral edge of the film to the bottom side of the article to be packaged by a folding member. The present invention relates to a packaging device for packaging.

[0002]

2. Description of the Related Art Heretofore, there has been known a stretch wrapping apparatus for wrapping an item to be packaged, such as a perishable food, stored in a polystyrene foam tray with a stretch film together with the tray. In this type of packaging device, a stretch film having a predetermined width is cut into a predetermined size according to the size of a tray, and a pair of film transports are provided on both side edges in the width direction of the film cut into the predetermined size. It is held by the device and conveyed to the wrapping station, and the product to be packaged stored in the tray is pushed up from below the film conveyed to this wrapping station to bring the product to be packaged into close contact with the film. Is folded by the folding member on the bottom side of the tray for packaging.

When the peripheral edge of the film is folded by the folding member on the bottom side of the tray for packaging as described above, in order to wrap favorably without causing wrinkles or slack, the film has a required tension. Need to be given and kept in tension. Therefore, for example, the actual development Sho 61-4810
As disclosed in Japanese Patent Publication No. 6, a pair of transfer devices for holding and transferring both side edges of the film are arranged in a divergent shape in the transfer direction of the film, so that the film is required for the transfer of the film. It has been proposed that the device be configured to give a tension of.

[0004]

By the way, in the case where a pair of transfer devices for sandwiching and transferring both side edges of the film are arranged in a divergent shape in order to apply a required tension to the film as described above. Causes the tension acting on the film to become non-uniform in the transport direction of the film, and
The tension acting on the film becomes excessive or insufficient. Then, when the tension acting on the film is too large, the peripheral portion of the tray is curved when pushing up the tray containing the articles to be packaged from below the film, or the film is folded when folded by the folding member. There is a risk of tearing, and if the tension acting on the film is insufficient, it is natural that wrinkles and slacks will occur on the surface of the film during packaging, so that good packaging cannot be achieved.

On the other hand, in this type of stretch wrapping device, the widthwise side edge of the film held by the film transport device is wrapped by a folding member, or the bottom side of the tray in which the wrapping product is stored. When the unclamping of the side edge of the film by the film transport device is too early, the film cannot be satisfactorily packaged due to slack, and when the unclamping by the film transport device is delayed. In this case, an excessive tension is applied to the film in accordance with the folding operation of the folding member, so that the peripheral portion of the tray is curved or the film is torn.

Therefore, according to the present invention, the package is pushed up from below the film transported to the packaging station by the film transport mechanism, and the peripheral edge portion of the film is folded by the folding member to the bottom side of the package and stretch-wrapped. It is an object of the present invention to provide a required tension to the film and to always maintain the tension acting on the film in an optimum state when the film is folded by the folding member.

[0007]

In order to solve the above problems, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 of the present application (hereinafter referred to as “the invention”)
The first invention) is a packaging apparatus for pushing up an article to be packaged from below a film which is tension-held in a packaging station, and folding the peripheral edge of the film to the bottom side of the article to be packaged by a folding member. A film transport mechanism for transporting the film to the packaging station, a pair of transport units for sandwiching both side edges of the film in the width direction and transporting the film to the packaging station, and the folding member from the start of transport of the film by the pair of transport units. By a gap adjusting mechanism for adjusting the gap between the two transport units by moving at least one of the pair of transport units in the width direction of the film by the time when the folding of the film is started by the pair of transport units. When both edges of the sandwiched film are folded onto the bottom side of the packaged item by the folding members As the tension of the film is maintained in an optimum state, in synchronization with the operation of the folding members, characterized in that a control means for controlling the operation of the interval adjustment mechanism.

The invention according to claim 2 of the present application (hereinafter referred to as “the invention”)
The second invention) is, in addition to the configuration of the first invention, a registration in which the amount of movement of the transport unit in the film width direction from the start of transporting the film to the start of folding is registered in advance according to the product to be packaged. Means is provided, and the interval adjusting mechanism is operated so that the movement amount of the transport unit becomes a movement amount according to the packaged item by designating the packaged item.

With the above structure, according to the first aspect of the invention, the film transport mechanism for transporting the film to the packaging station grips both side edges of the film in the width direction and transports the film to the packaging station. And a gap adjusting mechanism that adjusts the gap between the two conveying units by moving at least one of the pair of conveying units in the width direction of the film. By adjusting the distance between the pair of transport units that hold the edges,
It is possible to apply a required tension to the film until the folding member starts to fold the film, and the article to be packaged is satisfactorily packaged without causing wrinkles or slack in the film.

According to the present invention, in particular, when the side edge portion in the width direction of the film held by the pair of transport units is folded by the folding member to the bottom surface side of the article to be packaged,
The control means controls the operation of the gap adjusting mechanism in synchronism with the operation of the folding member, whereby the tension of the film is maintained in an optimum state, so that the film is loosened or the folding operation of the folding member is performed. Accordingly, it is possible to prevent the film from being broken due to an excessive tension acting on the film, so that the article to be packaged can be favorably packaged.

Further, according to the second aspect of the invention, the registration means is provided for preliminarily registering the movement amount of the transport unit in the film width direction until the start of the folding of the film by the folding member according to the article to be packaged. When the movement amount is changed according to the type of the packaged product, particularly the height of the packaged product, the size of the tray, etc., the change can be easily made only by the operation of designating the packaged product.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the packaging device 1 includes
A measuring mechanism 2 provided at the center of the front of the main body 1a,
A roll supporting mechanism 4 that is rotatably supported by a film roll 3a, which is also disposed on the side portion of the main body 1a and in which a stretch film 3 having a predetermined width dimension is wound in multiple layers, and from the roll supporting mechanism 4. A film transport mechanism 6 (see FIG. 2) that grips both sides of the unwound film 3 in the width direction and transports the film 3 to a packaging station 5 formed in the main body 1a located above the weighing mechanism 2.
And a folding mechanism 7 for wrapping a packaged product such as fresh food by the film 3 conveyed to the packaging station 5.
(See FIG. 2) and a sealing mechanism that is disposed above the weighing mechanism 2 in front of the packaging station 5 and heat seals the film 3 folded on the bottom surface side of the article to be packaged by the folding mechanism 7. 8 and.

Further, a display portion 9a and an operating portion 9b are provided on the upper surface of the main body 1a, and each of the mechanisms 2, 6, 6 is provided.
A control device 9 for controlling the operations of 7 and 8 and for calculating the price of the packaged product based on a signal indicating the weight of the packaged product measured by the weighing mechanism 2, and the control device 9
A label printer 10 for printing the weight, price, etc. of a packaged item on a label based on an output signal from the label printer and a label issuing machine 11 integrated with the label printer 10 are provided.

Now, the roll support mechanism 4 for rotatably supporting the film roll 3a will be described. The roll support mechanism 4 is mounted at a predetermined position on the main body 1a via a mounting bracket 12 as shown in FIG. A roll bar 13 having one end rotatably supported, and a diameter fixed to the other end of the roll bar 13 so that the film roll 3a can be inserted therethrough, and one end in the width direction of the film roll 3a. And a large diameter flange portion 15a that is movable in the axial direction on the roll bar 13 and that supports the other end portion of the film roll 3a in the width direction are integrally formed. Movable holder 15
And a coil spring 16 that is mounted between the movable holder 15 and the fixed holder 14 and urges the movable holder 15 in a direction to approach the fixed holder 14 side.

Further, the fixed holder 14 is biased by a leaf spring (not shown) or the like, and the fixed holder 14 is pressed.
Is provided with a stopper member 17 partially protruding from the outer peripheral surface of the film roll 3a. When the film roll 3a is inserted, the stopper member 17 is pressed by the inner peripheral surface of the film roll 3a to move and retract inside the fixed holder 14. In addition, after the film roll 3a is inserted, a part of the stopper member 17 projects from the outer peripheral surface of the fixed holder 14 to lock one end of the film roll 3a.

Therefore, as shown in FIG. 2, when the film roll 3a is inserted from the fixed holder 14 side, the movable holder 15 moves along the roll bar 13 according to the width of the film roll 3a. The one end of the film roll 3a is locked by the stopper member 17 provided on the fixed holder 14, whereby the fixed holder 14 and the movable holder 1
Both ends of the film roll 3a can be sandwiched between the film roll 3 and the film roll 5, and the film roll 3a can be held in the mounted state.

Next, the structure of the film transport mechanism 6 will be described. This transport mechanism 6 is one of the film rolls 3a rotatably supported by the roll support mechanism 4 as shown in FIGS. Of the film roll 3a disposed above the end portion (the left end portion in FIG. 2) of the film roll 3a.
A fixed-side transport unit 18 that holds the one side edge portion in the width direction of the rolled-out film 3 and transports the film 3 toward the packaging station 5, and the film roll 3a.
Is disposed above the other end (the end on the right side in FIG. 2) of the film roll 3a, and the other side edge of the film 3 unwound from the film roll 3a is clamped by the other side edge part in the width direction. Movable-side transport unit 19 for transporting to
And

Frame 1 of the movable side transport unit 19
On the lower surface of 9a, a pair of slide members 21 and 21 are fixedly mounted via mounting brackets 20 and 20. A pair of screw shafts 21 and 21 are rotatably supported by the main body 1a. The sprocket 23, 23 screwed to the screw shaft 22, 22 and fixed to one end of the screw shaft 22, 22 and the rotary shaft 24 a of the drive motor 24.
The chain mechanism 26 connects the sprocket 25 fixed to the end of the.

Then, by rotating the screw shafts 22 and 22 in predetermined directions by the drive motor 24, the pair of slide members 21 and 21 are moved to the screw shafts 2 and 2.
The movable side transfer unit 19 is slid along 2, 22, so that the entire movable side transfer unit 19 is moved in the axial direction of the screw shafts 22, 22, so that the movable side transfer unit 19 and the fixed side transfer unit 18 are moved. The distance between the and can be adjusted appropriately. In addition, the fixed-side transfer unit 18
Is fixed to the main body 1a side while being supported by the ends of the screw shafts 22, 22.

The fixed side transfer unit 18 and the movable side transfer unit 19 have the same structure. Therefore, the structure of the movable side transfer unit 19 will be described below, and the structure of the fixed side transfer unit 18 will be described. The description thereof will be omitted.

That is, as shown in FIG. 3, the movable side transport unit 19 has a direction in which the film 3 is transported between a pair of pulleys 27, 27 which are rotatably supported on both sides of the upper portion of the frame 19a. Upper conveyor belt 28 which is a timing belt stretched along the arrow A in FIG.
And the upper conveyor belt 2 between the pair of pulleys 29, 29, which are also rotatably supported on both sides of the frame 19a.
8 and a lower conveying belt 30 which is a flat belt or a timing belt stretched in parallel with the belt 28 below the belt 28, one pulley 29 of which is the drive motor 2
By being rotated by 9a, each conveyor belt 28,
29 is moved in a predetermined direction.

Below the lower conveyor belt 30, a plurality of clamp members 31 ... 3 are arranged along the tension direction.
1 is provided, and each of these clamp members 31 is
32 are attached to the upper portions of a plurality of swing levers 32 ... 32 swingably supported by the frame 19a, and bar members 33, 33 are supported at the lower ends of the swing levers 32. One ends of the bar members 33, 33 are connected to solenoids 34, 34 arranged at predetermined positions of the frame 19a via connecting levers 35, 35, respectively.

Then, as shown, each clamp member 3
When the lower conveyor belt 30 is pushed up by 1 and the solenoids 34, 34 are driven from the clamped state in which the conveyor belt 30 is in close contact with the upper conveyor belt 28, the bar members 33, 33 are connected via the connecting levers 35, 35. Moves in the feeding direction of the film 3 (direction of arrow A), and accordingly, each swing lever 32 swings in a predetermined direction, so that each clamp member 31 is separated from the lower conveyance belt 30. It can be clamped. In the clamped state in which the lower conveyor belt 30 is in close contact with the upper conveyor belt 28 as described above, the film 3 is securely held between the conveyor belts 28 and 30,
The film 3 cut into a predetermined size is conveyed to the conveying station 5 as the belts 28 and 30 move.

At one side of the movable side transport unit 19, that is, at the end on the side where the film 3 is introduced, the film 3 fed from the film roll 3a is placed on the upper side,
A pair of feed rollers 37, 38 rotated in a predetermined direction by a drive motor 36 for loading the lower transfer belts 28, 30 to the starting end side thereof, and a support shaft on the side of the main body 1a at one side of the movable side transfer unit 19. 39 is rotatably supported between a state shown by a solid line and a state shown by a chain line,
Further, a carry-in mechanism 42 is provided, which is provided with a pressing roller 40 that holds the film 3 with the feed roller 38, and a carry-in belt 41 that holds the film 3 with the lower transport belt 30. .

Further, a cutter 44 which is driven by a solenoid 43 to form perforations in the width direction of the film 3 is arranged between the feed rollers 37 and 38, and the carry-in belt 41 in the carry-in mechanism 42 is provided. Below the table, the carry-in belt 41 is driven by the solenoid 45.
Clamping members 46 that clamp both side portions of the film 3 in the width direction are provided between and.

The carry-in belt 41 is attached to the frame of the carry-in mechanism 42 via a spring (not shown) so as to be movable up and down, and the carry-in mechanism 42 is rotated upward as shown by a chain line in FIG. With the carry-in belt 41 in a floating state, the end portion in the longitudinal direction (feeding direction) of the film 3 pulled out from the film roll 3a is provided with a pair of feed rollers 37,
38, the loading mechanism 42 is rotated as shown by the solid line to bring the pressing roller 40 and the feed roller 38 into contact with each other, whereby the end portion of the film 3 is conveyed and the end portion thereof is conveyed. Are transferred to the upper and lower conveyor belts 28, 30.

Then, the pair of feed rollers 37, 38
The film 3 by a predetermined amount by the
And the perforation is formed in the width direction of the film 3 by the cutter 44 at this time, and thereafter,
The film 3 is conveyed again, and both side portions in the width direction of the film 3 are clamped by the clamp member 46 while the perforations formed by the cutter 44 are located on the immediate downstream side of the clamp member 46, and the above-mentioned conveyance is performed. Belt 2
By driving 8 and 30, the film 3 is cut at the perforations, and one side portion in the width direction of the film 3 cut to a predetermined length is sandwiched between the above-mentioned transport belts 28 and 30 and the packaging station. 5 will be transported.

The other side portion of the film 3 is clamped by a fixed side transport unit 18 having the same structure as the movable side transport unit 19 and transported to the packaging station 5.

Then, as shown in FIG. 4, a tray (a) is provided below the film 3 transported to the packaging station 5 by the fixed-side transport unit 18 and the movable-side transport unit 19 constituting the film transport mechanism 6. ) Is provided with a lifter mechanism 60 for receiving a packaged item (b) such as fresh food stored in (4) from the weighing mechanism 2 and pushing it up to the packaging station 5. A folding mechanism 7 for wrapping the tray (a) with the film (3) by the film 3 is provided.

The weighing mechanism 2 includes a weighing device 47 for weighing the packaged item (b) stored in the tray (a) and a pair of brackets 48 mounted on the upper surface of the weighing device 47. .. 50, which are stretched between the rollers 49, 49, and each of the carry-in belts 50.
0 are fixedly provided with projections 50a for pushing the end portion of the tray (a) to convey it to the lifter mechanism 60 side, respectively, and to be packaged in the tray (a) on each of the carry-in belts 50. When the product (b) is placed, the weight of the packaged product (b) is weighed by the measuring device 47 and the tray (a).
Is driven by the projection 50a as the carry-in belt 50 is driven, and is conveyed to the lifter mechanism 60 side.

Further, the lifter mechanism 60 includes the base 6
62, and a support member 63 that is rotatably supported by the upper ends of the support bars 62 and that receives and supports the bottom surface of the tray (a). ,
As shown in FIG. 1, the base 61 is lifted up and down at a predetermined stroke through a link mechanism 65 and the like by a cam member 64 arranged below the side of the main body 1a and driven by a driving means (not shown). The tray (a) supported by the upper portion of each of the supporting members 63 is pushed up from below the film 3 as shown by the chain line in FIG. As a result, the upper surface of the article to be packaged (b) is brought into close contact with the lower surface of the film 3 whose both ends in the width direction are sandwiched by the respective conveyor belts 28 and 30 of the fixed side conveyor unit 18 and the movable side conveyor unit 19. It has become.

As shown in FIG. 4, among the plurality of support bars 62 ... 62 of the lifter mechanism 60, the support bars 62 located at the front and rear ends are mounted on the base 61 via the brackets 62a. Is supported by
These support bars 62 are appropriately fallen according to the size of the tray (a) to prevent interference between the support bars 62 at the front end portion or the rear end portion and other arrangement portions when the base 61 is raised. It is like this.

Then, as described above, the peripheral edge of the film 3 whose both ends in the width direction are held by the respective conveyor belts 28 and 30 in the fixed side transfer unit 18 and the movable side transfer unit 19 is moved to the tray (a) by the folding mechanism 7. ) It is designed to be folded into the bottom side.

As shown in FIG. 4, the folding mechanism 7 includes a pair of left and right folding plates 66 and 66 (only one of which is shown) for folding both side edges of the film 3 in the transport direction to the bottom side of the tray (a). By a rear folding plate 67 that folds one side edge portion in the width direction of the film 3 held by the movable side transport unit 19 toward the front, and a discharge pusher 68 that discharges the tray (a) toward the heater mechanism 8 side. It has a folding bar 69 for folding the other side edge portion of the film 3 in the width direction toward the rear when the tray (a) is discharged.

Then, the left and right folding plates 66, 66
Are driven via timing belts 70, 70 (only one is shown) driven by a predetermined drive motor (not shown), and the rear folding plate 68 is driven via a timing belt 72 driven by a drive motor 71. The pusher 68 is further driven by the timing belt 7
It is arranged so as to be opposed to 2 and is driven via a timing belt (not shown) driven by a predetermined drive motor (not shown).

As shown in FIGS. 1 and 4, the upper part of the packaging station 5 is in contact with the upper surface of the packaged item (b) to prevent the packaged item (b) from floating. The pair of pressing members 73, 73 are rotatably supported.

Then, as shown in FIG. 5, a signal indicating the weight of the article to be packaged (B) from the weighing mechanism 2 is input to the control device 9 and the film from the control device 9 is input. Transport mechanism 6, folding mechanism 7, sealing mechanism 8,
A control signal for controlling the operations of the label printer 10, the drive motors 24 and 29a, the carry-in mechanism 42, the lifter mechanism 60, and the like is output.

Next, the operation of this embodiment will be described with reference to FIGS.
It will be described based on.

First, as shown in FIG. 9, the drive motor 36 of the carry-in mechanism 42 (see FIG. 3) feeds out the film 3 by a predetermined dimension, and then the feeding is temporarily stopped and the cutter 44 forms perforations. It The perforated film 3 is sandwiched between the conveyor belts 28 and 29 and conveyed, and is cut from the portion clamped by the clamp member 46, and the film 3 having a constant size is shown in FIG. As shown in the drawing, the fixed side transfer unit 18 and the movable side transfer unit 19 in the transfer mechanism 6 are sandwiched and transferred to the packaging station 5.
Then, the movable side transport unit 19 is moved by ΔL in the direction of increasing the width of the film 3 from the origin position indicated by the solid line in accordance with the operation of the drive motor 24, whereby a predetermined tension is applied to the film 3.

Then, as shown in FIG. 7, the article to be packaged (b) stored in the tray (a) is pushed up by the lifter mechanism 60, and the article to be packaged (b) is required as described above. It is adhered to the lower surface of the film 3 to which tension is applied without wrinkling or slack. After that, as shown in FIG. 8, the rear folding plate 67 moves forward, and the front end portion of the folding plate 67 comes into contact with the side edge portion in the width direction of the film 3 held by the movable transport unit 19. Then, when the rear folding plate 67 further advances from this state, the movable side transport unit 19 is returned to the original position as shown by the chain line, whereby the film 3 is not loosened and The film 3 is folded without applying an excessive tension to the film 3.

In this case, as shown by the chain line, the rear folding plate 67 moves forward to move the side edge of the film 3 to the tray (a).
When folded to the bottom side of the drive motor 24, as shown by the dotted line in FIG. 9, the reverse rotation time of the drive motor 24 is extended so that the ΔL amount becomes a negative amount, and as shown by the chain line in FIG. The transport unit 19 may be further advanced from the origin position. In this case, especially when the side edge of the film 3 is folded to the bottom side of the tray (a) by the rear folding plate 67, excessive tension is applied to the film 3. Is prevented from acting,
Since this tension is always maintained in the optimum state, the tray (a) can be favorably packaged without being curved downward or the film 3 being torn.

As shown by the dotted line in FIG. 9, the operation time of the drive motor 24 in the forward direction is extended to increase the moving amount ΔL of the movable transport unit 19 in the direction of increasing the width of the film 3.
It is also possible to variably adjust the tension applied to the film 3 by increasing. Also, this ΔL amount is the product to be packaged (b)
Is set in advance in accordance with the height of the tray, or the size and strength of the tray (a), and is registered in the control device 9. By operating the operating portion 9b of the control device 9,
The operation of the movable side transport unit 19 is controlled so that a predetermined amount ΔL corresponding to the item to be packaged (b) or the tray (a) is achieved.

Further, in the present embodiment, the roll supporting mechanism 4 can support the films 3 having different film widths, but the movable side transport is adapted to the change of the width of the film 3. By moving the unit 19, one side edge of the film 3 in the width direction can be held. In this case, film 3
It is also possible to provide a sensor for detecting the width of the film and to automatically adjust the movement amount of the movable side transport unit 19 according to the width of the film 3 detected by the sensor.

[0046]

As described above, according to the present invention, a film transport mechanism for transporting a film to a packaging station is provided.
A pair of transport units that grips both side edges of the film in the width direction and transports the film to the packaging station, and at least one of the pair of transport units is moved in the width direction of the film to adjust the distance between the transport units. Since it is configured with a gap adjusting mechanism, the gap adjusting mechanism adjusts the gap between a pair of transport units that sandwich both side edge portions in the width direction of the film, until the folding member starts folding the film. A required tension can be applied to the film in the meantime, and the product to be packaged can be well packaged without causing wrinkles or slack in the film.

In particular, according to the present invention, when the widthwise side edge portions of the film held by the pair of transport units are folded by the folding member to the bottom surface side of the article to be packaged,
By controlling the operation of the gap adjusting mechanism in synchronization with the operation of the folding member by the control means, the tension of the film is maintained in an optimum state, which causes slack in the film or the folding member. It is possible to surely prevent the film from being broken by the excessive tension acting on the folding operation, and the product to be packaged is satisfactorily packaged.

Further, according to the second aspect of the present invention, there is provided a registration means for previously registering the movement amount of the transport unit in the film width direction until the start of the film folding by the folding member according to the article to be packaged. Therefore, when changing the above movement amount according to the type of the packaged item, especially the height of the packaged item or the size of the tray, the change can be easily performed only by specifying the packaged item. Become.

[Brief description of the drawings]

FIG. 1 is a front view of a packaging device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view of the packaging device.

FIG. 3 is an enlarged cross-sectional view showing the configuration of the film transport mechanism as seen along the aa cutting line in FIG.

FIG. 4 is an enlarged sectional view of an essential part taken along the line bb in FIG.

FIG. 5 is a block diagram showing a control system of the packaging device.

FIG. 6 is a schematic explanatory diagram showing a state of the packaging device during film supply.

FIG. 7 is also a schematic explanatory view showing a state when the article to be packaged is pushed up.

FIG. 8 is a schematic explanatory view similarly showing a state when the film is folded.

FIG. 9 is a time chart showing an operating state of the packaging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 wrapping device 3 film 5 wrapping station 6 film transport mechanism 9 registration means, control means (control device) 9b operation means (operation part) 18,19 transport unit 22,24 interval adjustment mechanism (screw shaft, drive motor) 67 folding member (Post folding plate)

Claims (2)

[Claims] 1. A packaging device for pushing up an article to be packaged from below a film tension-held in a packaging station, and folding the peripheral edge of the film by a folding member to the bottom side of the article to be packaged. A film transport mechanism that transports a film to a packaging station, a pair of transport units that grips both side edges of the film in the width direction and transports the film to the packaging station, and the folding member from the start of transport of the film by the pair of transport units. By a gap adjusting mechanism for adjusting the gap between the two transport units by moving at least one of the pair of transport units in the width direction of the film by the time when the film is folded. When both side edges of the film held in the unit are folded into the bottom side of the packaged item by the folding member A packaging device, comprising a control means for controlling the operation of the gap adjusting mechanism in synchronization with the operation of the folding member so that the tension of the film is maintained in an optimum state. 2. A registering means for registering in advance the amount of movement of the transport unit in the film width direction from the start of film transport to the start of folding according to the product to be packaged, and to specify the product to be packaged. The packaging device according to claim 1, wherein the interval adjusting mechanism is operated so that the movement amount of the transport unit becomes the movement amount according to the article to be packaged.